Experts believe that land that is becoming deserts the size of Australia Russia and the

问题补充：

Experts believe that land that is becoming deserts the size of Australia, Russia and the United States put together

A. is equal

B. equals

C. is equalled

D. is equalled to

答案：

A. is equal

(答案→)B. equals

C. is equalled

D. is equalled to

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